No there is not a simple method like that. Adobe think that if you are knowlagable enough to use curves then the input and output figures with the ability to set points on the curve should be enough.
You can get round it to display the clipping points like levels by using a Curves adjustment layer grouped with the original image and a threshold adjustment layer sitting on top....Alternatively use the curves plugin I posted as this displays the clipping points for highlight and shadows and also as the advantage of you being able to select multiple nuetral points as well
